//wallace 2015 7 14

Element.prototype.typewriter = function (a) {

    var d = this,
        c = d.innerHTML,
        b = 0;
    d.innerHTML = "";
    var e = setInterval(function () {
        var f = c.substr(b, 1);
        if (f == "<") {
            b = c.indexOf(">", b) + 1
        } else {
            b++
        }
        d.innerHTML = c.substring(0, b) + (b & 1 ? "_" : "");
        if (b >= c.length) {
            clearInterval(e)
        }
    }, 75)
    return this

}
function abc() {
    var n = 1;
}